Discinida

Discinida is an order of brachiopods comprising the extant superfamily Discinoidea, and the extinct superfamilies Botsfordioidea (early—mid-Cambrian) and Acrotheloidea (early Cambrian–Early Ordovician).^[2] It represents a sister taxon to the Lingulids, and is possibly paraphyletic with respect to the Acrotretoids.^{[3][verification needed]}—or the acrotretids are paraphyletic with respect to it.^[4] The group displays a broad range of shell structures, some of which incorporate substantial organic or silicified components.^[3]

Discinida Temporal range: Cambrian Stage 2–Recent^[1] PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Brachiopoda
Subphylum:	Linguliformea
Order:	Discinida
Superfamilies
Discinoidea Discinidae Discina Discinisca Discradisca Pelagodiscus †Trematidae † Botsfordioidea ... †Acrotheloidea (?) ...

References

1. "Discinida". from the original on 2013-03-06. Retrieved 1 September 2016.
2. Ruppert, E.E; Fox, R.S.; Barnes, R.D (2004). Invertebrate Zoology (7 ed.). Brooks/Cole. pp. 821–829. ISBN 978-0-03-025982-1.
3. Williams, A.; Cusack, M.; Buckman, J. O. (1998). "Chemico-structural phylogeny of the discinoid brachiopod shell". Philosophical Transactions of the Royal Society B: Biological Sciences. 353 (1378): 2005–2038. doi:10.1098/rstb.1998.0350. PMC 1692430.
4. "Structure of the organo-phosphatic shell of the brachiopod Discina" (PDF). Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences. 1992-07-29.>